code: def testResolveSingleChannel_NoContextQueries_Empty(self):
      ch = self.make_channel_spec(
          """
        artifact_query {
          type {
            name: "Examples"
          }
        }
        output_key: "examples"
      """
      )
      resolved = channel_resolver.resolve_single_channel(
          self.mlmd_handle, ch
      )
      self.assertEmpty(resolved)
  
file_path: tfx/tfx/orchestration/portable/input_resolution/channel_resolver_test.py
imports: import tensorflow
  from tfx.orchestration.portable.input_resolution import channel_resolver
  from tfx.proto.orchestration import pipeline_pb2
  from tfx.utils import test_case_utils
  from google.protobuf import text_format
label_desc: Use image node_id 3 for calling the ChannelResolverTest obj's underlying member method code with example usage: obj.testResolveSingleChannel_NoContextQueries_Empty() without return types